/*
 Queue Plug-in

 Features:
 *Adds a cancelQueue() method for cancelling the entire queue.
 *All queued files are uploaded when startUpload() is called.
 *If false is returned from uploadComplete then the queue upload is stopped.
 If false is not returned (strict comparison) then the queue upload is continued.
 *Adds a QueueComplete event that is fired when all the queued files have finished uploading.
 Set the event handler with the queue_complete_handler setting.

 */

var SWFUpload;
if (typeof(SWFUpload) === "function")
{
	SWFUpload.queue = {};

	SWFUpload.prototype.initSettings = (function (oldInitSettings)
	{
		return function (userSettings)
		{
			if (typeof(oldInitSettings) === "function")
			{
				oldInitSettings.call(this, userSettings);
			}

			this.queueSettings = {};

			this.queueSettings.queue_cancelled_flag = false;
			this.queueSettings.queue_upload_count = 0;

			this.queueSettings.user_upload_complete_handler = this.settings.upload_complete_handler;
			this.queueSettings.user_upload_start_handler = this.settings.upload_start_handler;
			this.settings.upload_complete_handler = SWFUpload.queue.uploadCompleteHandler;
			this.settings.upload_start_handler = SWFUpload.queue.uploadStartHandler;

			this.settings.queue_complete_handler = userSettings.queue_complete_handler || null;
		};
	})(SWFUpload.prototype.initSettings);

	SWFUpload.prototype.startUpload = function (fileID)
	{
		this.queueSettings.queue_cancelled_flag = false;
		this.callFlash("StartUpload", [fileID]);
	};

	SWFUpload.prototype.cancelQueue = function ()
	{
		this.queueSettings.queue_cancelled_flag = true;
		this.stopUpload();

		var stats = this.getStats();
		while (stats.files_queued > 0)
		{
			this.cancelUpload();
			stats = this.getStats();
		}
	};

	SWFUpload.queue.uploadStartHandler = function (file)
	{
		var returnValue;
		if (typeof(this.queueSettings.user_upload_start_handler) === "function")
		{
			returnValue = this.queueSettings.user_upload_start_handler.call(this, file);
		}

		// To prevent upload a real "FALSE" value must be returned, otherwise default to a real "TRUE" value.
		returnValue = (returnValue !== false);

		this.queueSettings.queue_cancelled_flag = !returnValue;

		return returnValue;
	};

	SWFUpload.queue.uploadCompleteHandler = function (file)
	{
		var user_upload_complete_handler = this.queueSettings.user_upload_complete_handler;
		var continueUpload;

		if (file.filestatus === SWFUpload.FILE_STATUS.COMPLETE)
		{
			this.queueSettings.queue_upload_count++;
		}

		if (typeof(user_upload_complete_handler) === "function")
		{
			continueUpload = (user_upload_complete_handler.call(this, file) !== false);
		} else continueUpload = file.filestatus !== SWFUpload.FILE_STATUS.QUEUED;

		if (continueUpload)
		{
			var stats = this.getStats();
			if (stats.files_queued > 0 && this.queueSettings.queue_cancelled_flag === false)
			{
				this.startUpload();
			} else if (this.queueSettings.queue_cancelled_flag === false)
			{
				this.queueEvent("queue_complete_handler", [this.queueSettings.queue_upload_count]);
				this.queueSettings.queue_upload_count = 0;
			} else
			{
				this.queueSettings.queue_cancelled_flag = false;
				this.queueSettings.queue_upload_count = 0;
			}
		}
	};
}